I see your point now, you are opposed to public money for any chargers until the cars are in sufficient volume. However, Doug makes a good point: there's a chicken and egg problem that only public money can practically solve (as it did for level 2 charging), because right now the demand's still not enough for it to be profitable to run a DC charge network without government support. Sure the automakers can install some chargers, but even when they do it, it's at dealers, which in general mean a much less flexible solution. And I think it's unrealistic to expect all automakers to contribute equally, esp. given none of them, except Tesla, charges an extra fee specifically to fund a DC charging network.
There's going to be two situations really: install the dual standard chargers now for a relatively small extra cost before the Combo cars reach significant volume, or not do it and potentially have many complaining customers and end up having to retrofit or install a new charger that supports both. I think most charger owners would opt for the former, esp. given the number of automakers pledging that Combo is what they would use when they add DC charging to their cars.